The Ring,retaining, cataloged under National Stock Number 5325-01-411-9018, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Tridair Products. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-411-9018 |
| Primary Part Number | CA1671 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Usage Design | EXTERNAL |
| Material Document and Classification | MIL-S-25043 MIL SPEC 1ST MATERIAL RESPONSE AND AMS 5528 ASSN STD 2ND MATERIAL RESPONSE |
| Cross-Sectional Shape Style | RECTANGULAR |
| Major Thickness | 0.025 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN |
| Inside Diameter | 0.230 INCHES NOMINAL IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | LOOP |
| Surface Treatment | PASSIVATE |
| Material | STEEL COMP 631 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| CA1671 | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| Reference | Meaning |
|---|---|
| CA1671 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-01-411-9018 is a Ring,retaining, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-411-9018 has 1 manufacturer part number on file: CA1671 (Howmet Global Fastening Systems Inc. Div Tridair Products).
Key specifications for CA1671: Usage Design: EXTERNAL; Material Document and Classification: MIL-S-25043 MIL SPEC 1ST MATERIAL RESPONSE AND AMS 5528 ASSN STD 2ND MATERIAL RESPONSE; Cross-Sectional Shape Style: RECTANGULAR; Major Thickness: 0.025 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN. 9 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.